Page 162 - Electrical Installation in Hazardous Area

128 Electrical installations in hazardous areas

Ground

of release

X = Distance wall/source of release (1 5-3 m)
Y = Distance source to ground (Z - Y = 1.5-3 m)
Z = Extent of hazardous area
a = Z - X (vertical) or 2 - L (horizontal)
b = 0.5 Z (for densities greater than 1.3 only)
c = 0.5 Z (for densities less than 0.7 only)
d = wall length from edges of hazardous area
Note: Where d is less than Z it is prudent to continue the hazardous
area across the rear face of the wall as shown

Fig. 5.1 Effect of single walls within 1.5-3 m of sources of hazard